CREATE TABLE `edu_subject` (
  `id` char(19) NOT NULL COMMENT '課程類別ID',
  `title` varchar(10) NOT NULL COMMENT '類別名稱',
  `parent_id` char(19) NOT NULL DEFAULT '0' COMMENT '父ID',
  `sort` int unsigned NOT NULL DEFAULT '0' COMMENT '排序字段',
  `gmt_create` datetime NOT NULL COMMENT '創(chuàng)建時(shí)間',
  `gmt_modified` datetime NOT NULL COMMENT '更新時(shí)間',
  PRIMARY KEY (`id`),
  KEY `idx_parent_id` (`parent_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci ROW_FORMAT=COMPACT COMMENT='課程科目';

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.1.1</version>
        </dependency>
		<!--xls-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
		
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>

package com.zhz.serviceedu.controller;

import com.zhz.common.utils.R;
import com.zhz.serviceedu.service.EduSubjectService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

/**
 * <p>
 * 課程科目 前端控制器
 * </p>
 *
 * @author zhz
 * @since 2021-07-03
 */
@RestController
@RequestMapping("/eduservice/subject")
@CrossOrigin
@Api(tags = "課程科目")
public class EduSubjectController {

    @Autowired
    private EduSubjectService eduSubjectService;

    /**
     * 添加課程分類，獲取上傳過(guò)來(lái)的文件，把文件內(nèi)容讀取出來(lái)
     */
    @PostMapping("/addSubject")
    @ApiOperation(value = "添加課程分類，獲取上傳過(guò)來(lái)的文件，把文件內(nèi)容讀取出來(lái)")
    public R addSubject(MultipartFile file){
        //上傳過(guò)來(lái)的excel文件
        eduSubjectService.saveSubject(file,eduSubjectService);
        return R.ok();
    }
}

package com.zhz.serviceedu.service;

import com.zhz.serviceedu.entity.EduSubject;
import com.baomidou.mybatisplus.extension.service.IService;
import org.springframework.web.multipart.MultipartFile;

/**
 * <p>
 * 課程科目 服務(wù)類
 * </p>
 *
 * @author zhz
 * @since 2021-07-03
 */
public interface EduSubjectService extends IService<EduSubject> {

    /**
     * 添加課程信息
     *
     * @author zhz
     * @date 2021/07/02 02:18
     * @param file 文件對(duì)象，用于獲取excel文件
     * @param eduSubjectService 方便監(jiān)聽器部分引用
     */
    void saveSubject(MultipartFile file, EduSubjectService eduSubjectService);
}

package com.zhz.serviceedu.service.impl;

import com.alibaba.excel.EasyExcel;
import com.zhz.serviceedu.entity.EduSubject;
import com.zhz.serviceedu.entity.excel.SubjectData;
import com.zhz.serviceedu.listener.SubjectExcelListener;
import com.zhz.serviceedu.mapper.EduSubjectMapper;
import com.zhz.serviceedu.service.EduSubjectService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;

/**
 * <p>
 * 課程科目 服務(wù)實(shí)現(xiàn)類
 * </p>
 *
 * @author zhz
 * @since 2021-07-03
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {

    /**
     * 添加課程信息
     *
     * @param file 文件對(duì)象，用于獲取excel文件
     * @param eduSubjectService
     * @author zhz
     * @date 2021/07/02 02:18
     */
    @Override
    public void saveSubject(MultipartFile file, EduSubjectService eduSubjectService) {
        try {
            //文件輸入流
            InputStream in = file.getInputStream();
            //調(diào)用方法進(jìn)行讀取
            EasyExcel.read(in, SubjectData.class,new SubjectExcelListener(eduSubjectService)).sheet().doRead();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

package com.zhz.serviceedu.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.zhz.servicebase.execptionhandler.GuliException;
import com.zhz.serviceedu.entity.EduSubject;
import com.zhz.serviceedu.entity.excel.SubjectData;
import com.zhz.serviceedu.service.EduSubjectService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;

/**
 * @author zhouhengzhe
 * @Description: excel監(jiān)聽器
 * @date 2021/7/3上午2:28
 */
@Slf4j
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    /**
     * 創(chuàng)建有參數(shù)構(gòu)造，傳遞subjectService用于操作數(shù)據(jù)庫(kù)
     * 因?yàn)镾ubjectExcelListener不能交給spring去管理，所以需要自己new，不能注入對(duì)象
     * 此處一定要是public，不然永遠(yuǎn)獲取不到對(duì)象
     */
    public EduSubjectService eduSubjectService;
    public SubjectExcelListener() {
    }
    public SubjectExcelListener(EduSubjectService eduSubjectService) {
        this.eduSubjectService = eduSubjectService;
    }

    /**
     * 讀取excel內(nèi)容，一行一行進(jìn)行讀取，此處全是業(yè)務(wù)處理
     * @param subjectData
     * @param analysisContext
     */
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        log.info("進(jìn)入方法調(diào)用");
        if (StringUtils.isEmpty(subjectData)){
            throw new GuliException(20001,"文件數(shù)據(jù)為空");
        }
        //一行一行去讀取excel內(nèi)容，每次讀取有兩個(gè)值，第一個(gè)值為一級(jí)分類，第二個(gè)值為二級(jí)分類
        //判斷一級(jí)分類是否重復(fù)
        EduSubject existOneSubject = this.existOneSubject(eduSubjectService, subjectData.getOneSubjectName());
        if (StringUtils.isEmpty(existOneSubject)){
            existOneSubject=new EduSubject();
            existOneSubject.setParentId("0");
            //一級(jí)分類名稱
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            eduSubjectService.save(existOneSubject);
        }
        //獲取一級(jí)分類的pid值
        String pid=existOneSubject.getId();
        //添加二級(jí)分類
        // 判斷二級(jí)分類是否重復(fù)
        EduSubject existTwoSubject = this.existTwoSubject(eduSubjectService, subjectData.getTwoSubjectName(), pid);
        if (StringUtils.isEmpty(existTwoSubject)){
            existTwoSubject=new EduSubject();
            existTwoSubject.setParentId(pid);
            //二級(jí)分類名稱
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            eduSubjectService.save(existTwoSubject);
        }

    }

    /**
     * 讀取完成后執(zhí)行
     */
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }

    /**
     * 判斷一級(jí)分類是否重復(fù)
     * 因?yàn)檎n程的的parent_id為0時(shí)，代表是一級(jí)分類，并且一級(jí)分類數(shù)據(jù)不重復(fù)
     * @param eduSubjectService
     * @param name
     * @return
     */
    private EduSubject existOneSubject(EduSubjectService eduSubjectService,String name){
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject subject = eduSubjectService.getOne(wrapper);
        return subject;
    }
    /**
     * 判斷二級(jí)分類是否重復(fù)
     *
     * @param eduSubjectService
     * @param name
     * @param pid
     * @return
     */
    private EduSubject existTwoSubject(EduSubjectService eduSubjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject eduSubject = eduSubjectService.getOne(wrapper);
        return eduSubject;
    }
}

package com.zhz.serviceedu.entity;

import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import java.util.Date;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import java.io.Serializable;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

/**
 * <p>
 * 課程科目
 * </p>
 *
 * @author zhz
 * @since 2021-07-03
 */
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@ApiModel(value="EduSubject對(duì)象", description="課程科目")
public class EduSubject implements Serializable {

    private static final long serialVersionUID = 1L;

    @ApiModelProperty(value = "課程類別ID")
    @TableId(value = "id", type = IdType.ID_WORKER_STR)
    private String id;

    @ApiModelProperty(value = "類別名稱")
    private String title;

    @ApiModelProperty(value = "父ID")
    private String parentId;

    @ApiModelProperty(value = "排序字段")
    private Integer sort;

    @ApiModelProperty(value = "創(chuàng)建時(shí)間")
    @TableField(fill = FieldFill.INSERT)
    private Date gmtCreate;

    @ApiModelProperty(value = "更新時(shí)間")
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date gmtModified;

}